Light up sleep mask

I’m surprised a reasonable alternative to the alarm clock does not yet exist.  There was a prototype floating around for a while for a ring that’d vibrate at a particular time and I was saddened it never saw production.

I want a sleep mask with an internal set of LEDs that gradually get brighter at a certain time.  Alternatively, if planned for use in real light, electrosensitive plastics that transition from opaque to transparent at a particular time.